Table 2.

Variables definition.

Type	Variable	Code	Variable declaration
Dependent variable	Gender in quality ideology	a42	Gender in quality ideology score
Independent variable	Sports participation	a3009	Participation = 1; Not participating = 0
Control variables	Age	a3a	Young (15–44 years old) = 1; Middle-aged (45–59 years old) = 2; Older adults (60 years old and above) = 3
	Household registration	a18	Non-agricultural household = 1; Agricultural household registration = 0
	Marriage	a69	Married = 1; Unmarried = 0
	Region	s41	East = 1; Middle = 2; West = 3
	Educational background	a72	No education = 1; Private school and literacy class = 2; Primary school = 3; Junior high school = 4; Vocational high school = 5; Regular high school = 6; Technical secondary school = 7; Technical school = 8; College (adult higher education) = 9; College (formal higher education) = 10; Undergraduate (adult higher education) = 11; Bachelor degree (formal higher education) = 12; Graduate student or above = 13
	Social hierarchy	a43a	1 point = 1; 2 points = 2; 3 points = 3; 4 points = 4; 5 points = 5; 6 points = 6; 7 points = 7; 8 points = 8; 9 points = 9; 10 points = 10
	Socioeconomic status	a43e	Lower stratum = 1; Lower-middle stratum = 2; Middle stratum = 3; Upper-middle stratum = 4; Upper stratum = 5